Details of DisappearanceCrocker was last seen during the afternoon hours of December 9, 1996 at the Los Angeles Central Library in Los Angeles, California.
He was researching the July 1996 crash of TWA Flight 800 at the time.
He may have been carrying up to $200 in cash that day.
Crocker never returned to his residence.
He left his Hollywood home about 1 p.m. to research Flight 800. He usually took a bus to a subway that carried him to the library.
He said nothing unusual before leaving, though he appeared tired and pale after fighting a slight fever the day before.

Crocker had taken part in a Glendale radio talk show December 4 to discuss the July 17 crash of TWA Flight 800 off the coast of Long Island.
Peter Ford, a talk show host on station KIEV, said he received a package of material from Crocker dated Monday and postmarked Tuesday - the day after his disappearance.
Ford and Crocker are among those who believe a missile knocked the airliner from the sky, though federal authorities say they have not found what caused the plane to explode and plummet to the ocean.
Crocker had spent months researching that subject and other airline disasters.

Crocker was also known for his successful volunteer efforts to keep the former city Wellwood Murray Memorial Library open in downtown Palm Springs as a privately run facility.
He maintained an office in Palm Springs and spent several days a week volunteering at the small library.
Over the years, he has battled Palm Springs over issues ranging from the bid to sell public land for Indian gaming to what he perceived as the misuse of redevelopment money for a golf course.

Jeremy holds a Bachelor's Degree in mechanical engineering and a Master's Degree in Medical Science with no history of medical problems.